Thanks Charles and yes it’s just a GoPro file from a camera mounted on the tether that is post processed. I did a poor job of synchronising as was my first try but is actually pretty easy to do.
I also would like learn how to incorporate a live stream from a 2nd camera in BlueOS. I have seen discussion on these forums somewhere about how to do that and think the camera just needs an IP address which can then be accessed via BlueOS to live stream and presumably record.
Mainly used for cameras mounted internally in the BlueROV electronics enclosure as a networked connection is required. However I also saw some discussion about using the IP address of an externally mounted WiFi enabled GoPro since the WiFi signal can travel short distances underwater. Think this ability may be limited to older versions WiFi enabled versions of the GoPro (V3 and 4?).
Unfortunately cannot provide more information but appreciate any advice others might have about how to do this.